Analysis of SCLC transcriptome data revealed high expression of MUC1 and PP2A in the SCLC‐A, SCLC‐N, and SCLC‐P subtypes, accompanied with lower levels of NUMB and PKCζ (Figure 1G and Figure S8E (Supporting Information)), which is consistent with previous report.[38] But the high expression of MUC1 was only considerably associated with poor prognosis in patients with SCLC‐A subtype. Here, MUC1 is linked to small cell lung carcinoma.